Clean up actor state from the GCS (#8261)

* parametrize test

* Regression test and logging

* Test no restart after actor deletion

* Unit tests

* Refactor to subscribe to and lookup from worker failure table

* Refactor ActorManager to remove dependencies

* Revert "Regression test and logging"

This reverts commit 835e1a9091b51ca8efb00392d4cc4a665145de24.

* Revert "parametrize test"

This reverts commit f31272082831ba1a494816dd5511d87b24eca4c9.

* Revert "Test no restart after actor deletion"

This reverts commit 114a83de14329aa6ab787c80cd5757cf074a9072.

* doc

* merge

* Revert "Refactor to subscribe to and lookup from worker failure table"

This reverts commit 6aa13a05178d0b9aa1db9dee5c978c911b74fa3a.

* Revert "Revert "Test no restart after actor deletion""

This reverts commit 1bd92d09172aa8ab42632551cf9c56463f9598fe.

* Revert "Revert "parametrize test""

This reverts commit 639ba4d3b02167fb2b05e9878f9aa600bcec95b3.

* Revert "Revert "Regression test and logging""

This reverts commit f18b5f0db699a23cbccde32789e3639425e99ca4.

* Clean up actors that have gone out of scope

* Use actor ID instead of shared_ptr

* Clean up actors owned by dead workers

* Use actor ID instead of shared_ptr

* TODO and lint

* Fix unit tests

* Add unit tests for supervision and docs

* xx

* Fix tests

* Fix tests

* fix build

python/ray/tests/test_actor.py

@@ -699,6 +699,32 @@ def test_use_actor_within_actor(ray_start_10_cpus):
     assert ray.get(actor2.get_values.remote(5)) == (3, 4)
 
 
+def test_use_actor_twice(ray_start_10_cpus):
+    # Make sure we can call the same actor using different refs.
+
+    @ray.remote
+    class Actor1:
+        def __init__(self):
+            self.count = 0
+
+        def inc(self):
+            self.count += 1
+            return self.count
+
+    @ray.remote
+    class Actor2:
+        def __init__(self):
+            pass
+
+        def inc(self, handle):
+            return ray.get(handle.inc.remote())
+
+    a = Actor1.remote()
+    a2 = Actor2.remote()
+    assert ray.get(a2.inc.remote(a)) == 1
+    assert ray.get(a2.inc.remote(a)) == 2
+
+
 def test_define_actor_within_remote_function(ray_start_10_cpus):
     # Make sure we can define and actors within remote funtions.